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F200XTR HP Fuel Pump not activating
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Sorry will clarify
LP Pump unplugged from harness
Harness plug R/Y + L/W = 12.5 volts
R/Y to ground on block = 12.5 volts
L/W to ground on block = few mV
HP Pump unplugged from harness
Harness plus R/Y + L = few mV
R/Y to ground on block = 12.5 V
L to ground on block = few mV
Further tests
On the main harness plug that connects to the Pump Driver/modules. With Driver disconnect from harness
R/Y to ground = 12.5 V
L to ground = 12.5 V
L/W to ground = 12.5 V
Do the last two readings make sense I thought these were connections to the ECU that con*****ed negative side circuit and yet when put to ground show a voltage. Am I missing something here ?
cheers
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Hello
Can I please have the experts check my logic on faulty finding the Driver Module
Expected conditions normal operation:
Key ON
- LP Pump not active (only active 10/20 second cycles during running below 1500 rpm, continually running above 1500 RPM, source service manual)
- HP Pump active for 5 seconds
Wire R/Y is 12V active wire
Wiring diagram contained above in Boscoe post
Testing:
At key ON
LP Pump
ECU Pin 16 - Control wire colour B/W
Test 1
Driver disconnected from Harness
Voltage across Harness Pins B/W & R/Y = 0 volts EXPECTED
Test 2
Driver connected to harness
At LP pump plug voltage across L/W & R/Y = 12.5 volts INCORRECT should be 0 volts
HP Pump
ECU Pin 17- Control wire colour L/R
Test 1
Driver disconnected from Harness
Voltage across Harness pins L/R & R/Y = 12.5 volts for 5 seconds EXPECTED
Test 2
Driver connected to harness
At HP pump plug voltage across pins L & R/Y = 12.5 volts for 0.5 seconds INCORRECT should be 5 seconds
Can I please have opinion that Driver Module is faulty confirmed ?
thanks
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If the inputs to the driver are confirmed to be correct, and the outputs from the driver are confirmed to be incorrect, it would not be unreasonable to presume that the driver has failed.
Too bad that the service manual is so deficient in providing adequate test procedures. Typical crap Yam data.
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To complete the feedback loop a new Fuel Driver Module was installed and pumps etc all working correctly now. Thanks for the help in getting to the right answer with this one.
One further question there is a slight dripping of fuel coming from the Vapour Canister outlet when idling. Does this indicate the Canistar needs replacing
Andrew
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